Discussion on anti - electrotome interference method of ecg monitor

The principle of high-frequency electrotome is to heat the tissue when the electrode tip of electrotome is in contact with the body, so as to achieve the purpose of cutting the tissue. Compared with the traditional mechanical scalpel, electric scalpel has the characteristics of fast cutting speed and good hemostatic effect.  Ltd.The use of electric scalpel in clinical practice can shorten the operation time and reduce the complications.

However the high frequency electricity knife is essentially a frequency transformer, monitor manufacturer to low-frequency low-voltage electric current through frequency conversion variable pressure and power amplification,  Ltd.become as high as thousands or even tens of thousands of volts of high voltage high frequency current, this inevitably produces strong electromagnetic interference, and ecg monitoring equipment itself is very sensitive and monitoring data is easily affected by electric knife.

High frequency electric knife to solve electrical equipment for the electromagnetic interference, from the aspect of hardware to seek solutions, in general there will be several ideas, so, for example, when using electrotome protection system automatically cut off the electrical equipment of the input signal, electric knife cut ecg signal back,  Ltd.immediately after stop using monitor manufacturers so that the monitor can display accurate all the time in the working state of numerical values. In addition, the electrocardiogram electrode is placed on the receiving electrode to offset the interference generated by the electrotome. Or consider adding metal protective cover to the monitoring equipment to keep the monitoring equipment away from the electrotome equipment and so on.

Monitor manufacturer

The above methods can indeed reduce the influence of electrotome interference on ecg devices, but there will be a lot of inconvenience in the use. For example, when electrotome is used, the ecg monitoring device cannot collect real-time ecg data, and it is difficult to completely cancel by using the offset method. The metal protective cover and as far as possible away from the source of interference in the operation will also encounter practical factors.

What is said above is to minimize the interference of electrotome to ecg equipment from the hardware level, which is effective but also has defects. Can we also start from the software level, upgrade the system and algorithm, and give the ecg monitoring equipment a layer of protection?

The study found that the low-frequency interference caused by electrotome could be filtered out by software method. After algorithm optimization, the demonstration effect of electrocardiogram waveform was good, with only small vibration, and the characteristic bands of electrocardiogram could be clearly distinguished, so as to reduce the influence of electrotome on heart rate measurement to the greatest extent.

There are many methods to prevent electrotome interference in ecg monitor. Although it is effective, its practical application is still limited. If we want the ecg monitor to have the ability to prevent electrotome interference, we should pay more attention to the comprehensive use of various technical means, both from the hardware and software level, which may be a more efficient way to eliminate electrotome interference.